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Hi, I found the relationship of CBR = Su/23 in the thread256-57293. I wonder if anybody can let me know a source of this. I have recently worked on saprolite in a country of central america. It seems that this relationship is a ok fit. The material is relatively wet and the range of CBR is...

I managed to use Speedy to measure water content for residual soil. I had a good correlation between Speedy and Oven Dry. I did not use Nuclear Density Meter, because the correlation between NDM and Oven Dry was not good at all. I guess you can use any mean as far as it correlates to Oven Dry...

> BigH, dgillette, GeoPaveTraffic, oldestguy Thank you for your comments. I will study/investigate a little bit more. I often end up doing geotech drill with exploration drillers and equipments. It is sometime difficult to explain to them what I am trying to achieve. Have great holidays.

wait... the bit for reverse circulation jets circulation media upward inside of dualpipe rod. It cleans up only the inside of dualpipe, instead of cleaning between rod and casing. I have to use a single pipe rod with some mechanism at the bottom of rod in order to jet circulation media upward.

Thank you for the replies. > cvg Unfortunately, sonic drill is not available anywhere near me. Lack of tool/personnel is always an issue when working in developing countries. > GeoPaveTraffic If I don't find any method convincing myself, I may have to talk to my seniors and client to give up...

Greetings, I am going to drill into/through existing dams to install some instruments (mainly pore pressure meter). I wonder if you can tell me your experience in order to choose appropriate drill method. The dams are earth dams sitting on residual soil/weathered rock. I have to drill into...

A senior engineer showed up on my site. He stepped in bucket of excavator and wend down into a pit (3-4m deep). I thought that the bucket might protect him from relatively smaller wall collpase but not from collapse of entire pit. After watching many test pit wall collapses, I don't put...

GeoPaveTraffic and BigH, Thank you for your comments. Have you ever seen any schematic/paper showing interpretation of pile top settlement, tell-tale and difference of them under "cyclic loading" ?? ... some schematic explaining pile behaviour under cyclic loading based on tell-tale and pile...

I am looking at ASTM D1143-81 "Standard Test Method for Piles Under Static Axial Compressive Load". Section 5.2 Cyclic Loading (Optional) explaines how to apply 3 steps cyclic loading. I am wondering what extra interpretation I can make from cyclic loading test compared to simple loading...

Thank you for the replies, Falks. Test fill has to be done prior to construction for sure. It is at pre feasibility stage at this moment. I guess best I can do now is to make sure the material can be densified well by proctor test, and get basic properties such as shear strength, k, wopt...

USBR manul seems to be good one. Thank you for your suggestions.

Hello, I would like to polish my logging skill so that I can train juniors with confidence. Especially I want to know proper way to describe rock structure such as bedding or characteristics of discontinuity. What book/manual do you recommend ? I have found some ASTM, e.g.D2488 Standard...

Thanks for the replies. I am talking about a site in tropical region. I see thin overburden of laterite and thick completely to highly weathered bedrock underneath. I would like to use the weathered part to build embankment. Thus I have to know how compaction would be and how much material...

Hello, say, I have fine material of which strength is very stiff clay to extremely weak rock (S5-R0). I would like to build a soil structure, by compacting it. Is any method available to figure out how easy/difficult the compaction would be ? Do you think I can say something from...

Thank you for your replies. Actually, I have had this issue on Tropical Residual soils. 'not enough dispersion' makes a sense..small particles become a larger aggregate and sink faster than they are supposed to.... Tatsu

Greetings: I have seen huge drops (e.g.40%) on grading curves around 0.075mm, where sieving test results meet hydrometer test results. The curves are obtained with ASTM standard. I believe that the drops are caused by some sort of miscaluculation, but I could not find how to correct them. If...